Why marketing? According to the article, he already had the orders coming in via email, that's enough publicity to start. Some others here said it already, but

Why marketing? According to the article, he already had the orders coming in via email, that's enough publicity to start. Some others here said it already, but he could have just accepted the orders, start manufacturing a small batch and sell them. Why was that impossible to do? The article is completely lacking that detail. Why the focus on getting an investor?